Rotary and reciprocating tool operating machine



July 22, 1952 J. GRZYBOWSKI ROTARY AND RECIPROCATING TOOL OPERATING MACHINE Filed April 20, 1948 Q m mm mm a 2 F R 5 N w Qmw ww mm .a m J $1 mm mm W. 3 m W NW. QR NW..\Q I n hfi M 2. 2 Q Q mm NEH km N Q E: m

July 22, 1952 J. GRZYBOWSKI ROTARY AND RECIPROCATING TOOL OPERATING MACHINE Filed April 20, 1948 @1 mm my "mam;

Patented July 22, 1952 ROTARY AND RECIPROCATINGYTOOL OPERATING MAQHINE I I John Grzybowski, Ghicag o lll. Application April 20, 19 48, Serial'No. 22,087

The present invention I relates to rotary and reciprocating tool operating machines-wherein the two tools may be interchangeably employed, and its main object is the provision of a mechanisin for normally imparting a rotary movement to a'drill or a like rotary tool,v with means for rendering said mechanism inoperative and for hooking up into the machine of a reciprocating mechanism for operating a saw when the same had been substituted fora drill or a like tool;

A s'till further. object of the present invention is "to generally improve a drill operating machineconvertible into a sawv operating machine. iAnother object of the present invention is the provision in a rotary tool supporting member of means: for-shifting said member insavertic'al directionifor driving a rotary tool' toward. the. work,z;simultaneously permitting said. member tomake rotary movement. with. the tool. I A. still, further object of vthe-present invention is the provision in a rotary tool supporting mem ber. and an. engaging memben-associated. there'- with of a Joint therebetweenpermitting' longitudinal shifting, movement of .said supporting member when a'pressure is applied to; saidengaging member,- and which permits said supporting, member .to' rotate independently of said en-- gaging member. I a 1 Another object is the improving of aimachine capable,;of interchangeably receiving rotaryand reciprocating tools; Q

- Another object of the present invention is the provision of I an improved pulley which'can be readily rigidly affixed to a shaftwith which the same rotates, and which can readilybe discone nected from the shaft so that the same-may idlev thereon when itis necessary to render the P y 1 inoperative. I -With the" above general objects view and 7 others that will appear as the invention is bet- 2 Claim s. (citin -s) I .2 I Fig.1 3115' a similarview with the saw turned substantially to ninety degrees;

*:Fig. 4 is:- an 'enlarged. across-section view, on

line 4'--4;0I Fig.v2; v

:Fig, 5 .a' cross-sectional viewzonline 5--- 5 Fig. 6 (sheet 1) is an enlarged edge elevational view, partly in section, of the pulley with themechanism whereby the same maybe rigidly connectedwith or disconnectedfrom-a driven shaft; I

, *Fig. '7 side elevational view or the, pulley;

partly. in .OI'OSSrSBCtiOIl; I I

. Fig. '8 isacross-section view,- on a vertical plane, of a rod-thoughwhich: rotary and upright shifting movement are imparted to the drill or like rotary tool; I V

Fig.- 9 {sheet 2) is affragmentary-side elevational view-of'saw engaging means at one'oiits ends; and .v

. l0' is-a top'elevationview thereof. I v

Referring.in detail to thefpresent drawings there is shown base 1, supporting substantially U-shaped frame I I. The lowerend of said frame H; has laterally projecting Wings 12, through which a plurality of screws 13 are'driven'into base 10 for rigidly supporting said framethereon; The. lower end of said frame is provided with housing l 4, within which a 'mechanism hereine after described, forreciprocating a saw, is located.

"'Rigidly. supported upon the'upper endof frame 7 llyand upwardly projecting =therefrom; :.is Post l5, upon which sleeve 16 is positioned forv upward adjustingmovement 'Ascrew, having-laterally directed handle [1, driven through. said sleeve I6; engages said post l5; for maintaining said sleeve 16 ina rigid adjusted position upon said=post I5. I

Arm l8, rigidly formed with sleeve I6, projects rearwardly, and supportsshaft-li'at each'end of which an idler pulley 20 is positioned. The two idler pulleys 20 support two strands of endless Extending from said sleeve 16, forwardlyof the machine; at point substantially diametrically opposite of arm I8, is a frame member .22, .ter-

minating. atiitsfree front end in a pair ofarms 23, which are in' a-spaced relation on 'a vertical plane, and each of which at its front end is pro: vided with an integrally formed collar 24. ,The two collars 24 support rod '25 for a vertical sliding movement. The lower end of said rod'j25 carries chuck 26', which normally supports drill 21 or a like-rotary tool.

Coil spring 28 encompasses rod 25 and is interposed between upper collar 24 and stop washer 29, the latter affixed to said rod 25 in a manner hereinafter described.

Rod 25 has the upper end reduced in diameter for defining head 39, which is receivable within bore 3'! made in the lower end of cylindrical extension 32, which isv of a diameter corresponding to that of rod '25. Washer 29 is inserted over said head 39. and positioned upon the: resultant shoulder of rod 25, and is there maintained in a clamped position by the lower end of said extension 32. Said head 30 has a circumferential groove 33, within which the inner end oi screw, 34 is fitted, said screw 34 being driven through,

the wall of said extension 32, adjacent its lower end. By virtue of this arrangement rod 25 is capable of making rotary movement within ex;

tension 32, independentlyof the latter, and while 4 the latter remains stationary. Through connection by screw 34 rod 25 and extension 32 are ca pable of simultaneous: upright. shifting movement- The 'upper end of said-extension; 32 is e ated, defining recess 35, the twdresulting-leaves" of said upper end of extension 32-'ha've" a'li'ned transverse apertures 35, for the purpose hereinafter stated. v I 1'. The" mechanism for manually shifting :rod .25 and extension 32, and with them. chuck'r26- and tool 21, toward work 31, in a downw'ard upright:

direction, includes tongue 38, rigidly formed. withv and upwardly projectin'g -fromfiupperiarin' 23and Pivotally affixed t'o -s'aid' frame member 22. H tongue 38 by oneofits'erids-is link 'arni '39, the

other end of whichis'pivotallvafiixe'd to han'dle bar 49, the outer end of'which carries handle M.

Afiixed to extension 32 by means of-"screw42 is agresilient 'oblong arm 43, provided with a-knob 44 at itsupp'er end. Rigidly afiixedto said upper end of arm 43, and disposed towards extension- 32 is pin 45, Figs. 2'and'3, which normally enters apertures 36 inade in the two' leaves 'IOf th e bifurcated end of'extension'32 {Handlebar is provided with an aperture-which remainsin'an alinementwith apertures 36' when-said handle bar '40 remains within recess 35 in the upper end of extension 32L- Pin 45' will thus oon'stitute ai pivot iiponwhich said handle bar-49 'a'ngu'larly nection with extension 32, through pin "45, as' aforesaid, manual pressure exerted upon haridle' 41, in a downward direction; will'cause'the downward shifting movement ofextension 32"and rod: 25; the l'att'er within said collars 24, and-against the tnsion'of spring 28, compressing' thelatter for driving tool 2'! toward work 31. Therelease of pressure on handle 4i automatically 'shiftsfex teris'ion32 and rod 25 into an opposite dirction, fordriving tool 21- away from workf 3l by"virtue 9 hee- Of r n 8 W ca arin a ai the upper collar 24. and washer 29,jdrives" said extension 32. and rod 25 in an upwarddirection.

Afiix'ed to base I0 is moto'r46, which'rotates shaft. Keyed to saidshaft lsa pair or pulleys 49, over one of which cord ZIMiSjpaSsed, The opposite termination of, said.cord .2 l lS passedover pulley 49 which is keyed tsjr' azaana inl When said handle bar 40 is in a pivotalacorr-i rod 25, pulley 49 is of course keyed thereto.

When however tool 21 is disconnected from rod 25, and a saw is connected thereto, and a reciprocating motion is imparted to rod 25, as will be hereinafter described, the mechanism which keys pulley 49 to rod 25 is rendered inoperative for the purpose of permitting said pulley 49 to remain idle on said rod 25. Said mechanism and its, connectionwith pulley ,49 will be hereinafter described..p' we Whenzit is-desired to substitute rotary toolail by a reciprocating saw, tool 2'!- is removed from,

chuck '26,"and an oblong. bar 50,'Figs. 2 and ,3, by.

its cylindricahreduced extension 5| i inserted.

within said chuckg26. Said bar 50 is of .a square formation on a transverse cross-section. *The; lower end of said bar 50- isprovidedbn one oferits faces with recess 52 withinwhich the upper endof. 'saw53 is fitted. Clamp member 54 is fitted within recess 52 'and over the 'end'of saw 53 and driventoward the reduced'body portion'of said bar 59,'by means of screw 55"for clam i saw 53 to said bar 5|]; I i

4 The lower 'endtof saw 53 is rigidly aflixed' to the upper'end of square rod 5B,'which is set-for an 'uprightreciprocating movement 'withinboss 51 downwardly depending from the front portion of frame i I; and-which defines the upper wallof housing l4;

The upper end'ors'aid rod 56 is provided with recess 58; Figs. 9-and'10, within which clamping of rod 56 and said clamping block 59," being" in a" coplanar relation with frame I'l Will -receive therewithin 'saw' 53 in the same coplanar rel'a'tion as isseenin'Fig. 2 In order'to permit the positioningof saw 53 in-aplane which is substantial lyin a perpendicular relation with the-plane lasthereinabove mentioned, and thereby'bring' the saw to the position thereof shown-in Fig. "3, both said reduced end of rod 56 and clam-ping blocl 59 are provided'with a continuing'slot 6|; which remains in a perpendicular relation with the space defined by the said reduced upper end-of rod 56 and clamping block 59, as is clearly steam Fig. 10. In order to maintain saw/ 5 3 in ng-i'dasso a tion with rod 56 when the'lower' en'd"i'll ie reoiflhas been inserted within slot 51, screw-"62 is'driven through said clamping block 59: andtransversely o'fslot 61. 'When said'screw fills tightened the. two leaves in said block 59 efiec'ted by said slot 1 v will be brought towardseachother a's jwell as towards the lower end of sawli3'repos'ing wit n, said slot SI for clamping the lower end of' saw 531 to said block 59. .The continuation-of med ate the reduced bodyportion of the upper end off'rod" 56 is merely for the purpose of accommodating therewithin a. portion: of saw clampingbloclgfl. I a v ."Bar 50 does notzneed any special mechanism for accommodatingsawfl in the two' right-angled relative positions hereinabove described; because chuck: 26zand; rod 25. beingfreely. rotatable, permitrangular adjustments ofthe saw shown in Figs. rand-3.. -i

:The mechanism" for; reciprocatingrod' 56; and for iimpartingthereby a reciprocating motion to saw; 5.3,.bar 50, chuck 26, rod-'25 and extension 32, includes bar .63;-positioned within housing H, in a longitudinal relation. therewith. Itssinner: end isipivoted 'upon pinitl which is drivensthrough frame H. The. 'outerfendof said bar 53 is: bifurcated as at 65, for'receiving therewithin pin 66 passedathrough' the'lower end of rod 56 and extending therefrom in a lateral direction. Collar 61 mounted: upon said bar 63,..in alongitudinally adjustablerelation, supports the upper; endnof coil-spring 68; The lower'end of said coil spring 68 ismounted upon pin 69--which;-projects from base-|0. 'Saidspring BS-normally urgesbar 63-up wardly.' .1 f y Means' for reciprocating said bar; 63 includes shaft lfl passed through and supported by the lowerzend of frame H, or more: specifically, by the side wall defining saidhousing i 4. The inner end of said shaft .10 has disk ll rigidly afiixed 53" extending from thereto. Said diskll has an off-centrically located pin 12 the-outer free end of which pivotally connects with the upper end of bar 13, the lower end of which is pivoted to bar 61' by means of pin 14. By virtue of this mechanism, when shaft '10 rotates, it imparts a rotary'movementto disk TH which in turn, through pin 12 imparts an oscillating motion to bar. 13. The latterangularly'shifts said bar. 63, upand down upon pin 64. The-bifurcated end 650i, said bar'63 being ina pivotal connectionewiththe lower end of rod 56, through pin 66, imparts a reciprocating motion to said rod 56 and saw 53'; as aforesaid; Y The outer. end of said shaft llllhas keyedthereto. a' pulley, which is of:identicalxconstruction as pulley: 49, hereinabove mentioned, and for that reason is also marked with numeral 49. Said latter pulley is likewise provided with a. mechanism for either keying the same to shaft or'for disconnecting the same therefrom'and rendering said pulley idle upon saidshaft. The occasion for rendering said pulley 49 id'le upon said shaftflfl arises when saw 53. has been disconnectedfrom chuck 26 and rod 56v and in lieu thereof rotary tool 21 has been substituted.

-Said latter pulley and the otherof said pulleys48 has-an endless cord "stretched thereover for the purpose of transmitting rotary motion from said last mentioned pulley- 48'to said last mentioned pulley 49 and shaft 10, for reciprocating saw 53,-as'aforesaid. I

Boss 51- guides rod 56 in its reciprocating movement. The mechanism'for guiding'bar 56 inits reciprocating movement includes substantially U-shaped member '(Figs. 4 and 5) having laterally projecting wings 16, receiving a, plurality of screws 11, by means of which said member 15 is rigidly afiixed to the underface of the front portion of the upper end of frame I I. Cooperating with said member 15, and disposed therebelow is supporting plate 78-, which is maintained ina spaced-relation with the horizontal portion of said U-shaped member 15. by means of spacer J9, interposed between said member 15 and said plate l8,acljacent theirrearendsn The horizontal portions of said ueshapedmember l5, said plate 18 'sitions.

. 6 V I and; spacer. 19, are held." in a rigid. mutual relation by means of screws 80. 1'- Receivable within the sliding, plate .-8l. during: its sliding movement:

Centrally, and adjacent the front end-thereof, said sliding plate 8| is providedwith ailongitudinal'recess' 83, within which threaded boltBAg-is receivable. Said-threaded bolt passes through 'alinedapertures made in the; horizontal portion of ;said-,U -shaped; member-175 and said supporting plate- 18, which-apertures are alsoin alinement with said recess 83, as seen in Figs. 4 and ,5.-- The lower end of said-bolt 84,- which extends-below said supporting plate ,18 is engagedby knob85, which in conjunction with the head at the inner end-of said bolt- 84 constitutes clamping means for-the horizontal portion of said U-shaped member 15,.supporting plat I8 and sliding. plate for the purposeof holding said sliding plate- 81 in its adjusted outwardlyor inwardly. shiftedpo Adjacent the front end said sliding plate fll. is further provided with enlarged recess 86, with I which recess 83-mergesrsaid recess 86 being also iii acentralrelation. with said sliding. plate..8 l

r Said. recess 86-. forms in said plate 81 a pair'of opposed fingers 81,. between which-bar. is. .re- .c'eivable when said sliding plate I 8| is shifted outwardly, asis-seen in Figs. 2 and 3, for laterally supporting said bar' 50, thereby minimizing the .yibration of saidbar 5llandsaw 53, at the upper end of thelatter, and onla horizontal plane. One of thesides of. saidbar 50 contacts with-the shoulders resulting from said recesses 83; and 86, transversely ofsaidsliding plate 8l,=when thelatteris fully extended towards said barBD. as isseen in Fig.4.

Oneof-said fingers 6'! is made-longer than the 0ther,-and is downwardly bent, for defininghook 63,- which may be manually grasped forshifting said sliding plate 81 into its operative or inoperativepositions. p i I 7 :Each of. pulleys 49 includes the'conventional annular member, marked in-Figs. Sand '7 with numeral 48, and. provided atits margin with circumferential groove 89, within whichcord 2] or I l-is receivable. Integrally formed with the body portion of the pulley and extending-from one side thereof is collar 90,-which is of a:diam:- eter considerably smaller than the diameter 'of the pulley. .The body portion of thepulley and saidv collar-.SO-are provided with-a continuing bore for receiving .therewithin vrod- 25- or shaft l0, as-the case maygbe. At its base said collar 90 provided with .a substantially; semi-annular recess? 9!, which is in a transverse relation-with the body'of saidcollar 90-, andof whichoneside is the-side of pulleyfl and the opposite side is the body of said collarBO resultingfromwsaidrecess 9!. v Pivoted upon screw .9-2,,which extends through said collar 90 and engages by-its inner end the body portion of pulley 4'9,.is substantially crescent-shaped plate 93. Qn itsinner edge. said plate 93 is providedwithsemi-circular recess 94, withinwhich the periphery of rod; 25;): .ofshaft It I s h sw be c a1e3we asu 7 plate 93-remains inean operative position'there- Withhi$ Seen iI LFig L 7. ,L' .1 1 At the'edge of said plate 93, adj acent' said recess 94, said plate-93 is provided with t'o'oth 95,:Whih extends into key-way 96 made longitudinally on the periphery of said rod 25 or 'of sai'd shaft 10, as the case may be. i 'In' its operative positiom shown in-full lines in Fig. '7, said plate 93 contacts the-'peripheryof rodorof shaft l0,"as the case' maybe", with tooth95 within key-way 96, by virtue of which arrangement pulley 49 and-' collar 90 arein a-rigid locked-relation with said rod 25 orwithsaid; shaft its pivot point 92 v 'Adjacentthe corner defined by the outer pe ripheral wall and the opposite side'edge, said plate 93 is provided with rigidly ailixed knob IOI by means ofwhich said'plate 93 may be manually shiftedoutwardly of recess SI for bringing said tooth 95 out of keyway 96, into an inoperative position, shown in dotted'l'ines in Fig. 7, for the purpose of disconnecting-the pulley from its enggement with rod 25 or with shaft 10, as the caseinay he. 1 j Along its segment said collar 90 is} provided with recess- I02, which extends to theadjacent sideof pulley 49, and whichis at substantially diametrically opposite point of said screw 92.

Receivable within said recess I02 is lever I 03, which is pivoted to said collar 90 by means of screw 104. Said lever I03 is adapted for angular shifting movement adjacent the outer end of said'collar 90; Integrally formed with said lever I03 and downwardly projecting therefrom is extension I05, which normally enters opening I0 6 made in "plate 93, adjacent its free end. The opposite endof said lever, extending outwardly of collar 90 is provided with knob I01, whereby said outer end of lever I03 maybe manually de-' pressedfor shifting the opposite end thereof and. said extension I05 away from pulley 49 and away from plate 93. V-shaped leaf spring I08, set within recess I02,"and pivoted at its apex upon screw I09 which is passed through collar 90' and transversely of recess I02, bears by one of its ends' against the adjacent face of pulley 49 and by its' opposite end against lever. I03 adjacent said knob I01.

The purpose of said spring I08 is to maintain the free end'of said extension I05 in contact with the adjacent face of pulley 49.

'Whensaidplate 93 remains in an operative positionshown in full lines in Fig. 7, the free end of said extension I05 remains within opening I06, thereby preventing accidental outward shifting 'movement'of said plate '93 within recess 9I. Thus said plate 93 is rigidly engaged by said extension I05 for maintaining said plate 93 in a rigid {keyed relation with rod 25 'or Withshaft I0, asthe case'ma'y be; thereby maintaining pulley 49-interlocked therewith for imparting'rota tion thereto either through cord 2I or HI, respectively.

When it is necessary to render one or the other of the two pulleys 49 inoperative, the outer end-"foflever I03 is downwardly depressed against thetension [offspring I08, therebyfreeing the endof'e'xten'sion I05 from plate 93 and "shift from resuming its operative position. 'When. said,

plate remains in-the inoperative position,*-with tooth out of key-'way196; pulley 49 remains disconnected from rod 25 -iorfrom shaft-I0; as

the caseinay be; causing the pulley-to remain idle thereon. u

"It is further observed that whensaw 53 connected 'inthe machine, with pulley 49r on rod 25 made idle, andzwith pulley 49 :on shaft 10 in an operative position, bar 63 is actuated; spring 68 facilitates'actuationthereof in an'upright direction, while spring 28 assists in shift-" ing saw 53 in the same direction. The ofi centric arrangement of disk 'II through pin I2 -=in'engagement with bar 13 actuates said bar in either direction for reciprocatingsaw'53. .When saw has been disconnected from the machine, and rotary tool 21 substituted therefor; sliding plate 8| :is shifted intoits inoperative position, and 'outof the'pathof tool 21, as is seen in Fig. 1. 'Work 31 is of course supported uponany suit-' able platform, not shown, which may'in turn be supported upon base I0.

It is further noted that lower collar '24 pro vides a support for pulley 49 which is set upon rod 25. Sleeve I6, being adjustable upon post I5 and rigidly affixable thereto. by means of screw having handle I-I', 'permits adjustment of rod 25, chuck 26 and tool-21 in a:vertical.di+- rection to or away from work 3l.-.z-'I.'his"adjustment, in cooperation with link 39 and lhandle bar 40, tends to increase'ordecrease the tension of spring 28, depending whether said adjustment'was made upwardly or downwardlyythere by regulating the degree of pressure required on handle-' II to shift tool 27 downwardlmandthe' degree of tension in spring 28 for shifting said tool upwardly and away from work-31.

AS already noted, when rotary tool 21 is employed in the machine, with handle bar 40 in pivotal connection with extension 32, asseen in Fig.1, spring 28 has animportant function'of automatically lifting rod 25 and tool 21 in an upward direction and away from work 31 on release of manual pressure upon handle' II. The function of said spring 28 is equally important when a reciprocating tool is used in the machine; In that latter instance; spring 28 shifts rod 25 upwardly, simultaneously shiftingthereby the upper end of saw '53 on upward stroke of oscillating'bar 63. Obviously, were it not for that function of spring 28, 'on upward stroke of's'aid bar and the resultant upward shifting movement of rod 56 only the lower end of saw 53 would shift upwardly, causing the saw-to bend at some point of its length, because due to the flexible nature of the saw mere longitudinal pressure at one end thereof would be incapable ofjrecip d: cating the saw throughout its length] Thus, the function of said spring'28is common and akin whether themachineis used for operating 'a jr tary tool or is employed for'actuating a ream:

cating tool. The difference resides merely in the ultimate actions of the two tools with relation to the work.

While there is described herein preferred embodiments of the present invention, it is never theless to be understood that minor changes may be made therein without departing from the spirit and scope of the invention as claimed.

What I claim as new is:

1. A tool operating machine comprising an upright C-shaped frame, a substantially hollow boss formed on said frame adjacent the upper end thereof, an elongated shaft mounted in said boss for reciprocating and rotary movement, swiveled abutment means positioned on said shaft adjacent the upper end thereof, a helical spring mounted on said shaft, one end of said helical spring engaging said abutment and the other end thereof engaging said boss, tool supporting means mounted on the other end of said shaft, a first pulley mounted on said shaft, means on said pulley operable to connect said pulley to said shaft for rotation therewith, means for declutching said first pulley from said first shaft, said frame having a vertically extending guideway formed therein adjacent the lower end thereof 1 and spaced from said boss, an elongated member mounted for reciprocation within said guideway, an elongated lever pivotally connected to one end of said elongated member, said lever having the other end thereof pivotally secured to said frame, a link having one of its ends pivotally secured to said elongated lever intermediate the ends thereof, a disc mounted on said frame adjacent said link, means eccentrically connecting the other end of said link with said second disc,

a second pulley mounted on said frame in coaxial alignment with said disc and connected thereto for rotation therewith, and tool supporting means mounted on the other end of said elongated member, said first and second tool supporting means being substantially aligned with each other, means mounted on said second pulley operably to effect rotation of said disc, and means for driving said first and second pulleys.

2. A tool operating machine comprising an upright C-shaped frame, a substantially hollow boss formed on said frame adjacent the upper end thereof, an elongated shaft mounted in said boss for reciprocating and rotary movement, swiveled abutment means positioned on said shaft adja- 10 cent the upper end thereof, a helical spring mounted on said shaft, one end of said helical spring engaging said abutment and the other end thereof engaging said boss, tool supporting means mounted on the other end of said shaft, a first pulley mounted on said shaft, means on said first pulley operable to connect said first pulley to said shaft for rotation therewith, means for declutching said first pulley from said first shaft, said frame having a Vertically extending guideway formed therein adjacent the lower end thereof and spaced from said boss, an elongated member mounted for reciprocation within said guideway, a second pulley mounted on said frame, means connected with one end of said elongated member and said pulley for effecting reciprocation of said elongated member, tool supporting means mounted on the other end of said elongated member, said first and second tool supporting means being substantially aligned with each other, means mounted on said second pulley for rendering said reciprocating means inoperative, and means for driving said first and second pulleys.

JOHN GRZYBOWSKI.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date Re. 23,139 Langfelder Aug. 2, 1949 77,079 Moyer Apr. 21, 1868 101,788 Tripp Apr. 12, 1870 174,105 Benedict Feb. 29, 1876 326,994 Lafever Sept. 29, 1885 444,071 Laird Jan. 6, 1891 695,980 Wilhelm Mar. 25, 1902 787,138 Wehrlin Apr. 11, 1905 807,481 Miller Dec. 19, 1905 1,043,932 Herrick Nov. 12, 1912 1,656,656 Anderson et al. Jan. 17, 1928 2,052,600 Boss Sept. 1, 1936 2,426,028 Krueger Aug. 19, 1947 FOREIGN PATENTS Number Country Date 45,639 Sweden Sept. 13, 1919 250,379 Great Britain" Apr. 15, 1926 384,937

Great Britain Dec. 15, 1932 

